Hello Aspirant.

Jawaharlal Nehru University(JNU) does not offer B.sc in mathematics. You can't give the exam and expect a bsc course in mathematics. It offers Bachelor in arts(BA) degree through Jawaharlal Nehru entrance examination (JNUEE).

If you want you can pursue bsc in mathematics you can go for other colleges in DU or any other universities.

Best of luck !